fix: find workload spec.replicas

[0xgj]

Ⅰ. Describe what this PR does

fix get spec.replicas from unstructured object.

Ⅱ. Does this pull request fix one issue?

unstructured.NestedInt64(obj, "spec.replicas") can not get replicas from like:

apiVersion: apps.tkestack.io/v1
kind: TApp
metadata:
  annotations:
    kruise.io/auto-generate-persistent-pod-state: "true"
    kruise.io/preferred-persistent-topology: kubernetes.io/hostname
  creationTimestamp: "2023-11-28T14:25:14Z"
  generation: 6
  labels:
    app: example-tapp
  name: example-tapp
  namespace: kruise-system
  resourceVersion: "226631180"
  selfLink: /apis/apps.tkestack.io/v1/namespaces/kruise-system/tapps/example-tapp
  uid: a6c71435-b382-489c-ab5a-f55cc7de0a28
spec:
  defaultTemplateName: default
  replicas: 2
  selector:
    matchLabels:
      app: example-tapp

Ⅲ. Describe how to verify it

test it use TApp https://github.com/tkestack/tapp.

1. install TApp operator;
2. use TApp above, add annotations kruise.io/auto-generate-persistent-pod-state: "true", kruise.io/preferred-persistent-topology: kubernetes.io/hostname
3. get ersistentpodstates

apiVersion: apps.kruise.io/v1alpha1
kind: PersistentPodState
metadata:
  creationTimestamp: "2023-11-28T14:25:14Z"
  generation: 1
  name: example-tapp
  namespace: kruise-system
  ownerReferences:
  - apiVersion: apps.tkestack.io/v1
    controller: true
    kind: TApp
    name: example-tapp
    uid: a6c71435-b382-489c-ab5a-f55cc7de0a28
  resourceVersion: "226654296"
  selfLink: /apis/apps.kruise.io/v1alpha1/namespaces/kruise-system/persistentpodstates/example-tapp
  uid: 9484791e-ee7f-46bb-a659-39ea859fbd6c
spec:
  preferredPersistentTopology:
  - preference:
      nodeTopologyKeys:
      - kubernetes.io/hostname
    weight: 100
  targetRef:
    apiVersion: apps.tkestack.io/v1
    kind: TApp
    name: example-tapp
status:
  observedGeneration: 1
  podStates:
    example-tapp-0:
      nodeName: 9.134.111.49
      nodeTopologyLabels:
        kubernetes.io/hostname: 9.134.111.49
    example-tapp-1:
      nodeName: 9.134.111.49
      nodeTopologyLabels:
        kubernetes.io/hostname: 9.134.111.49

4. delete pod example-tapp-0 and recreate example-tapp-0, get pod yam, nodeAffinity injectedl:

apiVersion: v1
kind: Pod
metadata:
  annotations:
    kruise.io/injected-persistent-pod-state: example-tapp
  creationTimestamp: "2023-11-29T02:36:55Z"
  generateName: example-tapp-
  labels:
    app: example-tapp
    tapp_instance_key: "0"
    tapp_template_hash_key: "506133740347201105"
    tapp_uniq_hash_key: "6441391112236715516"
  name: example-tapp-0
  namespace: default
  ownerReferences:
  - apiVersion: apps.tkestack.io/v1
    controller: true
    kind: TApp
    name: example-tapp
    uid: 5c50a01a-5940-49bb-9a17-f2f516aabf08
  resourceVersion: "226693884"
  selfLink: /api/v1/namespaces/default/pods/example-tapp-0
  uid: d6545108-abd2-4ef5-b7a7-e67102145cd6
spec:
  affinity:
    nodeAffinity:
      preferredDuringSchedulingIgnoredDuringExecution:
      - preference:
          matchExpressions:
          - key: kubernetes.io/hostname
            operator: In
            values:
            - 9.134.111.49
        weight: 100
  containers:
  - command:
    - sleep
    - "3600"
    image: nginx:1.7.9
    imagePullPolicy: IfNotPresent
    name: nginx1
    resources:

Ⅳ. Special notes for reviews

[kruise-bot]

Welcome @0xgj! It looks like this is your first PR to openkruise/kruise 🎉

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (fa9a9a0) 48.30% compared to head (0f407db) 47.34%.

Files	Patch %	Lines
pkg/util/controllerfinder/controller_finder.go	75.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1462      +/-   ##
==========================================
- Coverage   48.30%   47.34%   -0.97%     
==========================================
  Files         154      156       +2     
  Lines       21667    22150     +483     
==========================================
+ Hits        10467    10487      +20     
- Misses      10048    10514     +466     
+ Partials     1152     1149       -3     

Flag	Coverage Δ
unittests	47.34% <75.00%> (-0.97%)	⬇️

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[0xgj]

/test

[0xgj]

/assign @furykerry

[ls-2018]

@0xgj please use git commit -s -m resubmit, solve DCO problem.

[ls-2018]

/lgtm

[0xgj]

@0xgj please use git commit -s -m resubmit, solve DCO problem.

done @ls-2018

[ls-2018]

/lgtm

[0xgj]

@furykerry can you help merge this commit?

[zmberg]

/approve

[kruise-bot]

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